Page 248 - All Industrial Tool Supply | General Catalog

TAPS • Technical Data
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Tapping
A tap produces a thread in a pre-drilled or punched hole by removing a small amount of material. The resulting threads
are used to hold two pieces of material together with screws or bolts. The removed material (chips) is stored in the
flutes, pushed forward in front of the tap, or drawn up along the flutes, removing the chips & cutting fluid from the hole.
STyleS

Hand: Popular in general machine tapping, CNC tapping or hand use. They are also appropriate
for tapping the majority of materials in blind or through hole conditions.

Spiral Point: Will shoot chips ahead of the cutting action, reducing clogging and loading in
the flutes. Commonly known as the Gun tap, a registered trademark of Greenfield Tap & Die.

Spiral Flute: Draws chips out of the tapped hole where chip disposal is a problem.

Thread Forming: Doesn't cut threads; it instead forms threads, therefore eliminating the
problem of chip removal.

Pipe: General purpose pipe taps are appropriate for threading a wide variety of ferrous
and non-ferrous materials. Ground thread pipe taps are standard in American Standard
Pipe Form (NPT) and American Standard Dryseal Pipe Form (NPTF). NPT threads
require the use of a sealer like Teflon tape or pipe compound. Dryseal taps are used for tap
fittings, which will pressure a tight joint without the using a sealer. American National
Standard Pipe Thread (NPS) is used when tapping pipe couplings.

Extension: Having extra long shanks to reach places that normally aren't reachable.

Miniature: Optimal for applications where the sizes are between 00 & 000.

Acme: Produce movement on machine tools and are extensively used to
manufacture jacks, valves and other mechanisms. Have 29º angles.

Nut: Used in nut tapping. The shank is smaller than the minor diameter which allows
several nuts to build on the tap simultaneously. The tap does not need to be reversed
after each nut is produced.

Pulley: Possess longer length shanks to tap pulley hubs and set screw holes. TAP THrEAdINg HolE

S.T.I.: Screw Thread Insert (STI)- used for tapping holes according to the screw thread standards.

THrEAdEd HolE wAITINg BuTToN HEAd cAP ScrEw
High Performance: Application specific based upon specific workpiece materials in high For ScrEw INSErTIoN MouNTEd IN THrEAdEd HolE
production expectations and for optimal performance.
ChamferS
The chamfer is the tapered portion located at the front end of the tap. The chamfered portion and the first full thread
beyond the chamfer combine to produce the finished thread of the part.

Taper (7 - 10 Threads): Plug (3 - 5 Threads): Bottoming (1 - 2 Threads): Modified Bottoming (2 - 2-1/2 Threads):
Commonly known as a starter tap, Most commonly used to machine Bottoming is the least efficient More efficient than a bottoming
has the longest standard chamfer in blind or through holes and for standard chamfer available and chamfer due to being slightly longer
while requiring less tapping torque. hand usage. This is also the allows use for threading close to the and having more working teeth.
most efficient chamfer. bottom of blind holes. Also allows for threading close to
the bottom of blind holes.